Long shot, but Steam games, including Proton games, will typically have the Steam overlay up. I don’t know how they implement the overlay, but if it’s via some kind of floating transparent window, maybe it could interact oddly with focus in Kwin. Maybe try toggling the Steam overlay off, see if that does it?
Long shot, but Steam games, including Proton games, will typically have the Steam overlay up. I don’t know how they implement the overlay, but if it’s via some kind of floating transparent window, maybe it could interact oddly with focus in Kwin. Maybe try toggling the Steam overlay off, see if that does it?
Alas, that was not the answer